Typical PoE Applications
Usually, terminal equipment (such as an IP phones, AP, and data collector) requires DC power supply. However, such devices are usually installed in corridors or on ceilings, where suitable power sockets are unavailable. On many large-scaled local area networks (LANs), the administrator needs to manage devices at multiple access positions simultaneously. These devices require unified power supply, making power supply management difficult.
As shown in Figure 24-7, after power over Ethernet (PoE) is deployed, the PSE directly supplies power to access devices (such as IP phones, APs, and other wireless LAN access devices). This eliminates the needs for external power supplies, decreases cable connections, reduces costs, and simplifies management.
